Some telephones, depending on the brand and model, have the intercom function, which allows to begin communication by sending the signal. When the signal comes, the telephone set rings a signal different from the standard ring tone call. After that the telephone temporarily switches off from the telephone line and works as an intercom.
Asylum Telecom is a provider of "turnkey" Internet-based communication services and technologies, focused on delivering flexible and scalable solutions to enable Internet service providers, consumer brand companies, and other enterprises the ability to pr
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